Preparation method of positive electrode material for high-power lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of preparation of positive electrode materials for lithium-ion batteries, can solve the problems of increased contact area between materials and electrolytes, low tap density and compaction density, and poor crystallinity of precursors. Achieve excellent cycle performance, good consistency, loose and porous surface

Active Publication Date: 2020-03-27
HUNAN CHANGYUAN LICO CO LTD +1
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Problems solved by technology

The principle of this method is that during the nucleation and core growth stages, the Mn 2+ Oxidized to Mn 3+ , which reduces the crystallinity of the precursor, so that the primary particle arrangement of the inner core is loose and the size is refined, but this method is only suitable for a certain amount of Mn (such as Li a Ni x co y mn z o 2 Middle z≥0.1) positive electrode materials, not suitable for materials containing no Mn or very low Mn content (such as nickel-cobalt-aluminum ternary materials)
At the same time, due to the oxidation during the synthesis process, the crystallinity of the obtained precursor is very poor, the tap density is very low, and the content of impurities Na and S in the precursor will be increased.
[0006] In addition, in the synthesis process of

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  • Preparation method of positive electrode material for high-power lithium ion battery
  • Preparation method of positive electrode material for high-power lithium ion battery
  • Preparation method of positive electrode material for high-power lithium ion battery

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[0041] Example 1:

[0042] A positive electrode material for a lithium ion battery of the present invention, the chemical formula of the positive electrode material is Li 1.2 Ni 0.6 Co 0.2 Mn 0.2 O 2 ,like figure 1 As shown, the positive electrode material is a secondary particle with a hollow microsphere structure, and the outer shell of the secondary particle is formed by aggregating several primary particles.

[0043] The preparation method of the positive electrode material comprises the following steps:

[0044] (1) Synthesis of Ni by co-precipitation method 0.6 Co 0.2 Mn 0.2 (OH) 2 Precursor, the synthesis of the precursor includes nucleation and inner core growth stage and shell growth stage, the specific operation includes: first, using sulfate containing nickel, cobalt and manganese to prepare a mixed metal salt solution with a total metal ion concentration of 2mol / L , the molar ratio of nickel-cobalt-manganese is 6:2:2, the sodium hydroxide solution that the

Example Embodiment

[0048] Example 2:

[0049] A positive electrode material for a lithium ion battery of the present invention, the chemical formula of the positive electrode material is Li 1.08 Ni 0.9 Co 0.08 Al 0.02 O 2 ,like figure 1 As shown, the positive electrode material is a secondary particle with a hollow microsphere structure, and the outer shell of the secondary particle is formed by aggregating several primary particles.

[0050] The preparation method of the positive electrode material comprises the following steps:

[0051] (1) Synthesis of Ni by co-precipitation method 0.9 Co 0.08 Al 0.02 (OH) 2Precursor, the synthesis of the precursor includes nucleation and inner core growth stage and shell growth stage, the specific operation includes: first, using sulfate containing nickel and cobalt to prepare a mixed metal salt solution with a total metal ion concentration of 2mol / L, nickel The molar ratio of cobalt is 90:8, and the aluminum molar concentration is 0.1mol / L metaal

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Abstract

The invention discloses a preparation method of a positive electrode material for a high-power lithium ion battery, which comprises the following steps: (1) synthesizing a NixCoyMz (OH) 2 precursor byadopting a coprecipitation method, the central part of the precursor consists of tiny particles, and the shell part of the precursor consists of large particles of which the particle size is larger than that of the tiny particles; and (2) uniformly mixing the precursor with a lithium salt, adding an oxide of a doped element during mixing, and then sintering to obtain the LiaNixCoyMzO2 positive electrode material. The positive electrode material is secondary particles with a hollow microsphere structure, the shell parts of the secondary particles are formed by aggregating a plurality of primary particles, the particles are uniform in size, loose and porous in surface and high in specific surface area, and the obtained particles are regular in shape, stable in material structure, relativelyhigh in rate capability and excellent in cycle performance. The preparation method is simple in process, low in cost and capable of achieving industrial production.

Description

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Claims

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Application Information

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Owner HUNAN CHANGYUAN LICO CO LTD
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